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Southern Cross Media Group (formerly Macquarie Media Group) is one of Australia's major media companies, as the parent company of Southern Cross Austereo. Its headquarters are in South Melbourne.
- Southern Cross Austereo
Southern Cross Media Group Limited, doing business as...
- Category:Southern Cross Media Group
Pages in category "Southern Cross Media Group" The following...
- Southern Cross Austereo
- History
- Characteristics
- Visibility
- Features
- Cultural Significance
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The bright stars in Crux were known to the Ancient Greeks, where Ptolemy regarded them as part of the constellation Centaurus. They were entirely visible as far north as Britain in the fourth millennium BC. However, the precession of the equinoxes gradually lowered the stars below the European horizon, and they were eventually forgotten by the inha...
Crux is bordered by the constellations Centaurus (which surrounds it on three sides) on the east, north and west, and Musca to the south. Covering 68 square degrees and 0.165% of the night sky, it is the smallest of the 88 constellations. The three-letter abbreviation for the constellation, as adopted by the International Astronomical Union in 1922...
Crux is easily visible from the southern hemisphere, south of 35th parallel at practically any time of year as circumpolar. It is also visible near the horizon from tropical latitudes of the northern hemisphere for a few hours every night during the northern winter and spring. For instance, it is visible from Cancun or any other place at latitude 2...
Stars
Within the constellation's borders, there are 49 stars brighter than or equal to apparent magnitude 6.5.[c]The four main stars that form the asterism are Alpha, Beta, Gamma, and Delta Crucis. 1. α Crucis or Acrux is a triple star 321 light-years from Earth. A rich blue in colour, with a visual magnitude0.8 to the unaided eye, it has two close components of a similar magnitude, 1.3 and 1.8 respectively, plus another much wider component of the 5th magnitude. The two close components are resolv...
Scorpius–Centaurus association
Unusually, a total of 15 of the 23 brightest stars in Crux are spectrally blue-white B-type stars. Among the five main bright stars, Delta, and probably Alpha and Beta, are likely co-moving B-type members of the Scorpius–Centaurus association, the nearest OB association to the Sun. They are among the highest-mass stellar members of the Lower Centaurus–Crux subgroup of the association, with ages of roughly 10 to 20 million years. Other members include the blue-white stars Zeta, Lambda and both...
Variable stars
Crux contains many variable stars. It boasts four Cepheid variablesthat may all reach naked eye visibility. 1. BG Crucisranges from magnitude 5.34 to 5.58 over 3.3428 days, 2. T Crucisranges from 6.32 to 6.83 over 6.73331 days, 3. S Crucisranges from 6.22 to 6.92 over 4.68997 days, 4. R Crucisranges from 6.4 to 7.23 over 5.82575 days. Other well studied variable stars includes: 1. Lambda Crucis and Theta2 Crucis, that are both Beta Cepheid type variable stars. 2. BH Crucis, also known as Welc...
The most prominent feature of Crux is the distinctive asterism known as the Southern Cross. It has great significance in the cultures of the southern hemisphere, particularly of Australia, Brazil, Chile and New Zealand.
Andrea Corsali – Letter to Giuliano de Medici, 1516 showing the Southern Cross at the State Library of NSW- 4
- Acrux (α Cru) (0.87ᵐ)
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Southern Cross Austereo is Australia's pre-eminent and most diverse entertainment company, with audio and visual brands and content reaching 95% of Australians.
Southern Cross Austereo (SCA) is one of Australia’s leading media companies reaching more than 95% of the Australian population through its radio, television, and digital assets. Under the Triple M and Hit network brands, SCA owns 99 stations across FM, AM, and DAB+ radio.
Southern Cross Broadcasting (Australia) Limited was a diversified Australian media company, that owned and operated a variety of media businesses, primarily in radio and television .
